OK, my two cents.
INFREQUENTLY, but it has happened to me and others, the bolt clamping the points, condenser wire and the low tension line from the coil to the distributor body, (through no fault of your own), makes contact with the distributor body, and......no spark, nothing. There is an insulator between insulating washers through all of which the bolt passes. Disassemble carefully, and make certain that the bolt is in fact isolated from touching the distributor body - centered in the larger hole in the dist. body, carefully reinstall points, hook up condenser wire and coil wire, add washer and tighten 7mm nut accordingly. Try it now and I'll betchur good.